Which of the following explains how one of the postulates in John Dalton's atomic theory later became robust knowledge? A. Some scientists found that some atoms of a particular element have different number of neutrons. B. Various scientists found that atoms combine in simple whole number ratios to form compounds. C. Some scientists found that atoms consist of subatomic particles with varying mass and charge. D. Various scientists found that sometimes a fraction of an atom can take part in a chemical reaction.